The groups prepared a problem tree on the top issue that they had prioritized, which was a way of identifying cause and effects.

UNESCO: SMALL ISLANDS VOICE

In a forthcoming issue of Tree Physiology, Paul Schaberg, a researcher working for the United States Department of Agriculture in Vermont, and his colleagues, will report the results of their experiments with sugar maples.

ECONOMIST: The science of autumn

"My father always expected he could be buried at his father's grave site, and it wouldn't have been an issue except for the tree roots, " he told The Associated Press.

CNN: AllPolitics - Cohen Intervened To Allow Arlington Burial

The stamps are from a special Christmas issue which feature a range of traditional Christmas tree decorations painted by UK artist Colleen Corlett.

BBC: Jersey Post stamps cheaper for Christmas